As far as patriotism goes, there has been no such thing as a Canadian owned carmaker since 1918, so we are in the position of the Irish, the New Zealanders, etc, we can buy whatever we want.
Of course if you go by vehicles made here, then Honda (with the Civic, Ridgeline, CSX and MDX) is just as 'Canadian' as GM (W-body/pickup/Equinox) as is Toyota (Corolla/Matrix/Rav4/Lexus SUV).
Tours of the Toyota Cambridge factory can be arranged here:
Toyota Motor Manufacturing Canada
Visitors can come and watch the entire production of a Toyota vehicle, from stamping up until the final inspection. The site is also home to a visitor's centre. Groups only and reservations are required.
Address: 1055 Fountain St. N. Cambridge ON Canada
Telephone 1 519 653-1111